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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">	        	方法	                                         	  功能说明</span><br><span class="line">int countByExample(UserExample example) thorws SQLException	       按条件计数</span><br><span class="line">int deleteByPrimaryKey(Integer id) thorws SQLException			   按主键删除</span><br><span class="line">int deleteByExample(UserExample example) thorws SQLException	   按条件查询</span><br><span class="line">String/Integer insert(User record) thorws SQLException			 插入数据（返回值为ID）</span><br><span class="line">User selectByPrimaryKey(Integer id) thorws SQLException		       按主键查询</span><br><span class="line">ListselectByExample(UserExample example) thorws SQLException	   按条件查询</span><br><span class="line">ListselectByExampleWithBLOGs(UserExample example) thorws SQLException   按条件查询（包括BLOB字段）。</span><br><span class="line">int updateByPrimaryKey(User record) thorws SQLException		    	按主键更新</span><br><span class="line">int updateByPrimaryKeySelective(User record) thorws SQLException	按主键更新值不为null的字段</span><br><span class="line">int updateByExample(User record, UserExample example) thorws SQLException	按条件更新</span><br><span class="line">int updateByExampleSelective(User record, UserExample example) thorws SQLException	按条件更新值不为null的字段</span><br></pre></td></tr></table></figure>
<span id="more"></span>

<h4 id="二、example实例解析"><a href="#二、example实例解析" class="headerlink" title="二、example实例解析"></a>二、example实例解析</h4><p><strong>mybatis的逆向工程中会生成实例及实例对应的example，example用于添加条件，相当where后面的部分</strong><br>xxxExample example = new xxxExample();<br>Criteria criteria = new Example().createCriteria();</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">			方法												说明</span><br><span class="line">example.setOrderByClause(“字段名 ASC”);	 			添加升序排列条件，DESC为降序</span><br><span class="line">example.setDistinct(false)					去除重复，boolean型，true为选择不重复的记录。</span><br><span class="line">criteria.andXxxIsNull							 添加字段xxx为null的条件</span><br><span class="line">criteria.andXxxIsNotNull						 添加字段xxx不为null的条件</span><br><span class="line">criteria.andXxxEqualTo(value)					 添加xxx字段等于value条件</span><br><span class="line">criteria.andXxxNotEqualTo(value)				 添加xxx字段不等于value条件</span><br><span class="line">criteria.andXxxGreaterThan(value)				 添加xxx字段大于value条件</span><br><span class="line">criteria.andXxxGreaterThanOrEqualTo(value)		 添加xxx字段大于等于value条件</span><br><span class="line">criteria.andXxxLessThan(value)					 添加xxx字段小于value条件</span><br><span class="line">criteria.andXxxLessThanOrEqualTo(value)			 添加xxx字段小于等于value条件</span><br><span class="line">criteria.andXxxIn(List&lt;？&gt;)						添加xxx字段值在List&lt;？&gt;条件</span><br><span class="line">criteria.andXxxNotIn(List&lt;？&gt;)					添加xxx字段值不在List&lt;？&gt;条件</span><br><span class="line">criteria.andXxxLike(“%”+value+”%”)				 添加xxx字段值为value的模糊查询条件</span><br><span class="line">criteria.andXxxNotLike(“%”+value+”%”)			 添加xxx字段值不为value的模糊查询条件</span><br><span class="line">criteria.andXxxBetween(value1,value2)			 添加xxx字段值在value1和value2之间条件</span><br><span class="line">criteria.andXxxNotBetween(value1,value2)		 添加xxx字段值不在value1和value2之间条件</span><br></pre></td></tr></table></figure>
<p><strong>1.查询</strong><br>        ① selectByPrimaryKey()</p>
<p>User user = XxxMapper.selectByPrimaryKey(100); //相当于select * from user where id = 100</p>
<p>② selectByExample() 和 selectByExampleWithBLOGs()</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">UserExample example = new UserExample();</span><br><span class="line">Criteria criteria = example.createCriteria();</span><br><span class="line">criteria.andUsernameEqualTo(&quot;wyw&quot;);</span><br><span class="line">criteria.andUsernameIsNull();</span><br><span class="line">example.setOrderByClause(&quot;username asc,email desc&quot;);</span><br><span class="line">List&lt;?&gt;list = XxxMapper.selectByExample(example);</span><br><span class="line">//相当于：select * from user where username = &#x27;wyw&#x27; and  username is null order by username asc,email desc</span><br></pre></td></tr></table></figure>

<blockquote>
<p>注：在iBator逆向工程生成的文件XxxExample.java中包含一个static的内部类Criteria，<br>Criteria中的方法是定义SQL 语句where后的查询条件。</p>
</blockquote>
<hr>
<p><strong>2.插入数据</strong><br>①insert()</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">User user = new User();</span><br><span class="line">user.setId(&quot;dsfgsdfgdsfgds&quot;);</span><br><span class="line">user.setUsername(&quot;admin&quot;);</span><br><span class="line">user.setPassword(&quot;admin&quot;)</span><br><span class="line">user.setEmail(&quot;wyw@163.com&quot;);</span><br><span class="line">XxxMapper.insert(user);</span><br><span class="line">//相当于：insert into user(ID,username,password,email) values (&#x27;dsfgsdfgdsfgds&#x27;,&#x27;admin&#x27;,&#x27;admin&#x27;,&#x27;wyw@126.com&#x27;);</span><br></pre></td></tr></table></figure>

<hr>
<p><strong>3.更新数据</strong><br>①updateByPrimaryKey()</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">User user =new User();</span><br><span class="line">user.setId(&quot;dsfgsdfgdsfgds&quot;);</span><br><span class="line">user.setUsername(&quot;wyw&quot;);</span><br><span class="line">user.setPassword(&quot;wyw&quot;);</span><br><span class="line">user.setEmail(&quot;wyw@163.com&quot;);</span><br><span class="line">XxxMapper.updateByPrimaryKey(user);</span><br><span class="line">//相当于：update user set username=&#x27;wyw&#x27;, password=&#x27;wyw&#x27;, email=&#x27;wyw@163.com&#x27; where id=&#x27;dsfgsdfgdsfgds&#x27;</span><br></pre></td></tr></table></figure>

<p>②updateByPrimaryKeySelective()</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">User user = new User();</span><br><span class="line">user.setId(&quot;dsfgsdfgdsfgds&quot;);</span><br><span class="line">user.setPassword(&quot;wyw&quot;);</span><br><span class="line">XxxMapper.updateByPrimaryKey(user);</span><br><span class="line">//相当于：update user set password=&#x27;wyw&#x27; where id=&#x27;dsfgsdfgdsfgds&#x27;</span><br></pre></td></tr></table></figure>

<p>③ updateByExample() 和 updateByExampleSelective()</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">UserExample example = new UserExample();</span><br><span class="line">Criteria criteria = example.createCriteria();</span><br><span class="line">criteria.andUsernameEqualTo(&quot;admin&quot;);</span><br><span class="line">User user = new User();</span><br><span class="line">user.setPassword(&quot;wyw&quot;);</span><br><span class="line">XxxMapper.updateByPrimaryKeySelective(user,example);</span><br><span class="line">//相当于：update user set password=&#x27;wyw&#x27; where username=&#x27;admin&#x27;</span><br></pre></td></tr></table></figure>

<blockquote>
<p>updateByExample()更新所有的字段，包括字段为null的也更新，建议使用 updateByExampleSelective()更新想更新的字段</p>
</blockquote>
<hr>
<p><strong>4.删除数据</strong><br>①deleteByPrimaryKey()</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">XxxMapper.deleteByPrimaryKey(1);  //相当于：delete from user where id=1</span><br></pre></td></tr></table></figure>

<p>②deleteByExample()</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">UserExample example = new UserExample();</span><br><span class="line">Criteria criteria = example.createCriteria();</span><br><span class="line">criteria.andUsernameEqualTo(&quot;admin&quot;);</span><br><span class="line">XxxMapper.deleteByExample(example);</span><br><span class="line">//相当于：delete from user where username=&#x27;admin&#x27;</span><br></pre></td></tr></table></figure>

<hr>
<p><strong>5.查询数据数量</strong><br>①countByExample()</p>
<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">UserExample example = new UserExample();</span><br><span class="line">Criteria criteria = example.createCriteria();</span><br><span class="line">criteria.andUsernameEqualTo(&quot;wyw&quot;);</span><br><span class="line">int count = XxxMapper.countByExample(example);</span><br><span class="line">//相当于：select count(*) from user where username=&#x27;wyw&#x27;</span><br></pre></td></tr></table></figure>

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